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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71d252d9d3373c8479665e714921d6c39f86473c00ea459ad1c2a4c0c23e5e6' 
  AND token = '3ci1laMGR7JtwxRD792fy/p5m9Mkaf7aSZhsLmLt/W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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