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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6df105ba7df6a537436b3b85fe05c09544e3b5361906b259b00ae3cd2ef5882' 
  AND token = 'MJspBezkX0xbDPNn5XXVf9tnRmem3FvSs0TU1NHbqLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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