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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2759fa3645b13dd5e7b4828ef5faea0b94986172413ba0df34973926c8a20e' 
  AND token = 'BJhr9swR+03pD1134Cv6x4Us4/jUmn9LGQRxNc7DO4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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