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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6b86a181ab30f2b4d5d8032d384ed7459cad8de0b0ce2c291382eae21b9fa0' 
  AND token = '7OLDThktRzhOZA++lKnbwtKf3BsJ7/yaw7x5uhjWkbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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