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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36271f9a2ae245f5e6d299348059d98446b9a307ce2cffefe297934715ee0bbf' 
  AND token = '12uymT40cAxDYgbmf3/JCLl3SoyYaLB96vlzcl5+0g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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