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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c65937f2bd191f5baf1c4aef04d5bd74ef0e071414367d11258b8b1d2486bf' 
  AND token = 'bzyzwNv2oMfojdWC4Nv5QcZL4L/s1Asw0JHGkJvFLBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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