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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8a4e78f30de99fc6eb204d9ba040aba4520142d8790220c22970c8dd860a5d' 
  AND token = 'yLJFUKrAHQ64W7tzf831VEY2Tfk0qJgIaym2cbaRsOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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