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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d01ff1f6df493ed668b94ad0ad44b564837f0544861a2360a92bce26c64e06' 
  AND token = 'U/1+PonHddxyTUgluVmh+8aSl2HX68Pw0h7HDYytidQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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