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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3dcb2a88e4157471832cba548c553381bc6240effac2a14c67f2b2863968faf' 
  AND token = 'Pq6X290D8oJYCdffCu85v1+KNk9kb6cewG1aJUdWisc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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