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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a0f9fa37930175be2054ba477197624c29bcbe4baaf16995a5436d9ce639df' 
  AND token = 'x+S2gDSal/E3LmK03bAucUYN0B4crTXim9nCVClUVxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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