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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b003e60e2989feb144583ff86f9155f03e78d38dcf3d61778315e54bf2da842' 
  AND token = 'y0ArDfcnv7fR0W4Wa2A+HiHfI56WnXW7/NgesijcJS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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