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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96518fbf8dd6b64b6599f75047949f45dfeffcd90636852da731ffa22814e0c' 
  AND token = 'nhhVnAFnixZoHOo0N9g8Z/op/t1h/0hlVGlgr1vl/ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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