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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bff5fcd01c9cdcd11807db190290a74fb799910eb4ad25a17f60174d4297b4' 
  AND token = 'Pk5PQ1Mror9Grlk4qbBSEd0GrjnADOaurE6zmWra0Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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