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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c950c0092ba89f679467a223b90f3acc1864e263c33f33e5641c6fe7224ab3f' 
  AND token = 'KXxa1j2Ah00epCbYYTwdbDxnchltz202lx5KMzmrNgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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