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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9680a95e553c852243529dc5c96484d625f4b4060d3e875622c8d4f8be6b44' 
  AND token = 'X9xdVejg+oDW1LoqjMNNpcHTGsAqjLSqLiR8dcii80U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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