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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17e6a5292d0bc66c9d6c8a44c9299dbef0b4cc580a6ddad2306f406b5e53aee' 
  AND token = 'G7ij7I5z5Q5rDupRZYBSKkqLVBhCLFT00XhDZI1hxi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}