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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb38d9a61d1aff7c98ebd9a47a304de824a0e848eac9d2aeec2ba2188fd0462d' 
  AND token = 'GgBmVz1CKDrAmk0DXF2j3x31rxTghrkjWJKGOqeXePc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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