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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3c0dc5f87bf2f5a5e2043f37d6711dcd9913cc5d0c2a1e144f85be69c8837f' 
  AND token = '3vhL+Tn0xGvdPGFxQR6FtTPY56CoxNR6dhQccY3X4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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