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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779b693dcf359f2490ad13c5d7bdc4430231e3c05eaf6473939c1c28d99677b3' 
  AND token = '32EtJAwG5WoLB3VeRvh7Ynjs9xnKcBJw5T0HlhAHkTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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