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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c743464366e2db45f6afb9348041c22073a6b6e2ff67c2d159d97d788478b949' 
  AND token = 'XfAsOI5b18PMtM8ihms01cEyZu9SGVqZjLmrWB4/0VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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