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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d07a2d57c7f4ea65236c2634d2a94cad7bc20826b56d419b0b5dce2309b80d7' 
  AND token = 'wmkeG0i5r7j8L7hE9+AwULnl2vZTWr/IGTe1uN0rAXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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