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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819649c56932033622c7e8b59a0f0a693c949df774f8538c0cf2677c690e5f82' 
  AND token = 'YrJhSNuWSStWgJYFsMhi1irJQkwfjsa3CvYH3hvHalU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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