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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e90e31ce2a9de7926f9b45f8ba973c4d517b2c3ca29715c3234a34ea71f5d1d' 
  AND token = 'cg9y1P0l6rCoRwGE/AeLJ9rE86boY78YzdS2wT9d4uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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