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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c19f01fe2cfabc27fad2554b5a504247db11981899b1a5d56889eb272d1849b' 
  AND token = 'r9ZdMFNZcg5k0OJaWG4wcd+Vx89qpR25y/Kxu+xozu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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