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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c2e2fd3f6634ad95bb225f83e006e6dd7bfdb49eb7dbaa2c196a0c024f2c17' 
  AND token = 'G/vBdp8iMubmhPouJjhvsL5j9FE5xNGJQ1TPfzGAyIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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