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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a031b91335f76cf5e5a32a19bae596ac48f2f18528a2cc8057f6b0d3ce8dd3b1' 
  AND token = '9P99kwtxtZA6X1bcepOQC/6vG1VQt8pXY5M1pbQopxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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