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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d8ec62a0e3b9fbee7fa474614d93132e3c84707626d4d2d7456b0440d68876' 
  AND token = 'pzNwuFNVBmLyEP4ybSzM7ZxTc5z0NOaLesVMP3L1m/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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