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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153e7d28d3ae318dbf1a0b2ba1ef479a7a78c1d7dff3d61af8ba0d487d8050b6' 
  AND token = 'OI9+4Bpw+XfqfI4r55mYiza7Y4cNw9kL8t7kUNHoH0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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