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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84fe0cac50dd6e5ca7fb1bfcef9eae9e365e00e827540a5ce27dd8eece3afd3' 
  AND token = 'vw5F0+iYEbrtaxSaAS1OV6bGfe+rSKbEOO/l2NqMYwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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