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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27752156ae42bdedfeea55f9708f76485e3f36cd3bea984309f8e15d43024357' 
  AND token = 'CZOWb1NULOBXUG72g4gl1NnatuvSO4q2jkwVV/11R7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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