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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e52fac0a9f6933350dac26f33b75a5ba39bb8ce77ff37c1d84a3e7999b1bea62' 
  AND token = 'AskhOW2f1txoMOOF6b4Rye6/DxrevP/Z5fZpoOfHhFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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