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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30574c8819c426efcf01c6e904d1c307e3521e5e5bc423d7a16a051c3a49eb62' 
  AND token = 'M+B/Mc6vU03n4g4eJUN36+gDQ4jHmvuo+wVxW2F2K/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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