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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '794fcd13ae965743937083f8fe2b7eb994cf4bdbb94c01d05de77a4d2abc37bc' 
  AND token = 'C/tRKHqIPdB0KKZwhTPF9FsrodpabhGVCiXxlVT3Zy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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