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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937da543255d1df426a63e43ddc66b83615edb4462ee2b6d526faf21dfb015e7' 
  AND token = '5wyX1/ZO5k2c4uJFjgJZx6LtK6HiTR/AoLAgUF7AqNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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