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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4837230a58da170c2a1a2b7383960ef5bb469f41b9d40b43cf6349a72a473a' 
  AND token = 'ejawWAO7Nf5qkt4QixAB7Yolm7cvVTO9vyBkR1+Ni3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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