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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a197cc6fad3a1c7f05a687a230e90c010d92ed2757c196bd25b8b29b28c9eb45' 
  AND token = 'yrd20Sxd3M8Bl20qAe62sIfFfQ2t6EsYaNq525UAMmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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