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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1637f894bb6b1d02ab3f7cd383f6de2e04fdadcbb31e9e90830bdcf1aa2c58f0' 
  AND token = '4OQvpM28KS+phMpnlSWGGcIYh/770ryAy+xHssk64bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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