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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0cfc10f9185964e15c65753eb57ee907d1afa438e37a7a1e89f33becda13dc' 
  AND token = 'B/G+tTFtP94w87OGaSOBO38BTa59rNzx4whoWlGSJYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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