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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04801e47f4603b0f87a8094a1c3cddf2c92f4c8c737b89d02aac045dc8c4b011' 
  AND token = '3t8Uk9cSCEmb2nUrTURzWj/JBpCQL/Cg8fPwQjLf/KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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