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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f1a07c9715f43250395cca85e02dae3b56c61d4fd9fdd986feeb698709b262' 
  AND token = 'y+UEA6mN6o1mg4dLXr1TKngi7mXk6wtNdYHobqj3jfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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