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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecefc905b7f5b32484eecc5e0deddf63dedc8c09cd2e321cd0362bc4f76498e' 
  AND token = 'ffY0FlMxRAcKR5BT1OrxCCbnwyK+tt19ONu7RFi6WNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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