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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f030644365153226e1093e7e062d47b94e5a8f7611c09de6808f6c17a47c7b' 
  AND token = 'NmEUSPRYiAzEiMFtYJ9Zb5xs/56YzaPjV/S4k279d8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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