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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa232e6649f904f83076b68b47b85afd6c271c1f0ff4b5f219fa091d6f5566d' 
  AND token = 'GJbcy8TM/XCrG6bJnCWEGTQ2sJc3Bde5vLzdnj53SeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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