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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9333c6e7dcdbb18c8c1a3113b0febcee786f18015d0a9b32564c243ba400a910' 
  AND token = 'VYuqZtlN8ELmN+CaUvInfxZcOK92quEACpsp9oG/91A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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