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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304d48ab31475386b32334f6cc3edbaae49d7146820131d9d88200aad32b94f0' 
  AND token = 'gyhEXi1yXT9rCJG8msIi43JjMhmLbhC3tX6XJsgmyNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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