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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c99c23a7fbf816ce5167906f90c40d793d40c1b27efa2e418c6141996f6dc0' 
  AND token = 'TW/AYLRlt8vKmlL6X2mEuu5BCqaKMfqReN65Vb7SH0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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