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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922f4a9e751e7f4de0d822cd4eceae9cc9f5728a4f0adca558a6e155e4bdf50b' 
  AND token = 'V3rKks8a//HdfNxBIAt2X/hiHWclfkhisESXCXJOXiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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