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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0700ee76061a42609f619d8cdf4aa71d735e4d1ce4812e92fa27a89fafd6d27' 
  AND token = 'AOn+4sdARWI55xBvPRB+Ja726bayIqp+tHYOR/zmUQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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